Jakobssonite Balic-Zunic T, Garavelli A, Mitolo D, Acquafredda P, Leonardsen E Mineralogical Magazine 76 (2012) 751-760 Jakobssonite, CaAlF5, a new mineral from fumaroles at the Eldfell and Hekla volcanoes, Iceland Locality: Hekla volcano, Iceland _database_code_amcsd 0019194 CELL PARAMETERS: 8.6010 6.2903 7.2190 90.000 114.610 90.000 SPACE GROUP: C2/c X-RAY WAVELENGTH: 1.541838 Cell Volume: 355.091 Density (g/cm3): 2.776 MAX. ABS. INTENSITY / VOLUME**2: 9.740619227 RIR: 1.143 RIR based on corundum from Acta Crystallographica A38 (1982) 733-739 2-THETA INTENSITY D-SPACING H K L Multiplicity 18.10 19.96 4.9013 1 1 0 4 19.57 2.90 4.5355 -1 1 1 4 22.74 100.00 3.9099 2 0 0 2 25.36 4.83 3.5121 1 1 1 4 27.17 3.10 3.2816 0 0 2 2 27.25 7.27 3.2728 -2 0 2 2 28.38 45.35 3.1451 0 2 0 2 28.51 89.08 3.1307 -1 1 2 4 31.54 2.65 2.8363 0 2 1 4 34.38 2.50 2.6083 -3 1 1 4 35.60 3.07 2.5216 -2 2 1 4 39.69 18.55 2.2707 0 2 2 4 39.75 7.29 2.2677 -2 2 2 4 40.53 9.17 2.2257 -1 1 3 4 42.87 1.05 2.1096 -4 0 2 2 43.92 6.55 2.0614 -3 1 3 4 44.75 9.61 2.0252 1 3 0 4 44.80 8.10 2.0230 3 1 1 4 45.42 15.85 1.9968 -1 3 1 4 46.45 38.79 1.9549 4 0 0 2 47.97 1.35 1.8964 -2 2 3 4 50.33 24.06 1.8131 -1 3 2 4 50.58 30.58 1.8047 -2 0 4 2 52.08 7.05 1.7561 2 2 2 4 52.21 6.13 1.7520 -4 2 2 4 54.20 2.51 1.6924 -3 1 4 4 54.20 5.96 1.6923 -3 3 1 4 55.33 10.51 1.6605 3 1 2 4 55.33 13.10 1.6603 4 2 0 4 55.49 9.61 1.6559 -5 1 2 4 55.86 1.90 1.6459 1 3 2 4 55.94 1.52 1.6437 -3 3 2 4 56.05 6.43 1.6408 0 0 4 2 56.21 4.31 1.6364 -4 0 4 2 56.31 1.42 1.6338 3 3 0 4 58.33 5.58 1.5819 -5 1 3 4 58.69 2.90 1.5732 -1 3 3 4 58.71 9.03 1.5726 0 4 0 2 59.01 9.97 1.5653 -2 2 4 4 60.54 1.41 1.5293 0 4 1 4 61.05 2.01 1.5177 5 1 0 4 62.02 2.08 1.4965 3 3 1 4 63.79 3.34 1.4590 2 4 0 4 64.15 1.32 1.4517 -4 2 4 4 65.86 1.55 1.4182 0 4 2 4 65.90 1.98 1.4174 -2 4 2 4 68.90 1.22 1.3628 5 1 1 4 69.84 1.93 1.3468 -3 3 4 4 70.82 6.27 1.3305 3 3 2 4 70.95 9.28 1.3284 2 0 4 2 70.96 4.24 1.3282 -5 3 2 4 71.24 4.27 1.3237 -6 0 4 2 71.79 3.47 1.3149 -5 3 1 4 72.53 1.71 1.3033 6 0 0 2 75.05 1.94 1.2656 -4 4 1 4 75.90 1.43 1.2536 5 3 0 4 77.22 2.05 1.2354 -1 5 1 4 77.98 4.65 1.2253 4 4 0 4 78.10 3.04 1.2237 2 2 4 4 78.38 5.04 1.2201 -6 2 4 4 79.63 1.04 1.2040 6 2 0 4 81.12 4.36 1.1856 -2 4 4 4 81.13 2.19 1.1855 -3 3 5 4 81.44 2.64 1.1817 -3 1 6 4 82.37 1.57 1.1707 3 3 3 4 83.33 1.02 1.1596 -7 1 4 4 85.53 1.32 1.1353 0 4 4 4 87.76 2.43 1.1122 -1 5 3 4 87.93 1.64 1.1105 -5 3 5 4 ================================================================================ XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.